This pattern features three Spiral Skull Snail Shells in small, medium, and Giant snail sizes! The Snail body is not included in the pattern - for that you'll need the snail pattern itself, but the spiral skull shell can be finished by itself too!
You can find the pattern here on my website: https://shop.craftyintentions.com/b/U8ptr
Here on Ravelry: https://www.ravelry.com/patterns/library/spiral-skull-snail-shells
Or here on Etsy: https://www.etsy.com/listing/1773137169/add-on-spiral-skull-snail-shells-crochet